<html>
  <head>
    <title>TestTZ</title>
    <script src="https://momentjs.com/downloads/moment.js"></script>
    <script src="https://momentjs.com/downloads/moment-timezone-with-data.js"></script>
  </head>
  <body>
    <h3>TZ: <span id="tz"></span></h3>
    <h3>TZ2: <span id="tz2"></span></h3>
  </body>
  <script>
    document.getElementById("tz").innerText = moment.tz.guess();
    document.getElementById("tz2").innerText = moment.tz.guess(true);
  </script>
</html>
